aman mohadin is in benghazi once again for us tonight. good evening. >> reporter: good evening, lester. well, the investigation into the killing of the americans here in benghazi intensifies. today there was a powerful message for greater unity in the region as protests continued against the american-made anti-islam preliminary. ♪ >> reporter: a prayer for peace in the heart of the middle east. pope benedict holding sunday mass in front of 300,000 worshippers. his message? reconciliation and tolerance. but there was little of either today as the demonstrations continued. also in lebanon today hundreds took to the streets in an anti-american protest. in pakistan hundreds of protesters clashed with police after demonstrators broke through a barrier near the u.s. consulate in karachi. protesters set american flags on fire. more than 100 people were arrested in paris while hundreds more gathered today in london. in tunisia where the protests were the most violence, nbc staff was evacuated, and 50 u.s. marines were deployed to secure the emb